Develop Reference

Force stop packages in android

hi everybody
i need some help please does anyone know how can i put this in my manifest tag in androidmanifest.xml file:
android:sharedUserId="android.uid.system"
==>because when i do the deployment failed .
and how can i use this permission :
<uses-permission android:name="android.permission.FORCE_STOP_PACKAGES" />
==>because xamarin studio tell me it's a unknown permission
to use this:
ActivityManager am = (ActivityManager)GetSystemService (Context.ActivityService);
am.forceStopPackage(PACKAGE_NAME);
_Any help will be appreciated _

Setting the sharedUserId to android.id.system actually means declaring your app to belong to the system. You cannot do that unless your app is actually signed with the system certificate. In order to get that certificate, you would have to negotiate with the manufacturer of the device. The only possibility you would actually be able to get the system key is running a firmware on your device that you built and signed yourself.
ActivityManager.forceStopPackage() is reserved for system applications and there is no chance to use it in a user-space application.
You can find various explanations on the Internet and on SO, e.g. here: Android Permission Denial: forceStopPackage()

If your goal is to quite your app, I would direct you to this question:
Is quitting an application frowned upon?
Which sums up how and why you might close your own application.
Actually terminating the application is near impossible, but sending it to the back ground or finishing all activities gets the similar effect of being gone from the screen. This is by design and is explained in the article
To close other applications is either a ROOT only or system specific. So your application could request root permission on android if available. Otherwise, I believe it is possible to negotiate a app with some root access through google play but I assume it is very complicated.

Clear all recent tasks Programmatically

I am trying to remove all recent tasks through a program. Before posting a question, I googled it, but no luck at all.
I tried to use ActivityManager.killBackgroundProcess(pckagename), but it also does not remove the task from a recent task list.
I also tried the link
Android, how to clear the recent task list which could get from Home button in most phone? Reflection is a possible way?
I always get the following exception
java.lang.SecurityException: Permission Denial:
removeTask() from pid=23297, uid=10051 requires
android.permission.REMOVE_TASKS
Even if I already specified the android.permission.REMOVE_TASKS permission in the manifest.
How can we clear the list of recent tasks programmatically, so that the user can see no recent tasks in a recent task list?

REMOVE_TASKS is a signature-level permission. It can only be held by apps written by the developers of the device firmware, such as a device manufacturer or ROM mod author.

Try this out in android manifest inside the launcher activity:
android:excludeFromRecents="true"

I just met with the same problem. My duty was to remove a 3th party app from recent list.
Okay, I don`t know how clear the recent list, but I know, how not to put your app there.
start it with: FLAG_ACTIVITY_NO_HISTORY flag .
This worked for me, I hope I can help with it for you.
details:
min SDK level 14
Cheers,

In your AndroidManifest.xml, you need to add this:
uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"

Close a background android application

The requirement is to kill an application which is pushed to the background after a time interval. How can i do that in android? If anybody could share the code snippet, it would be great.
Thanks,
Jinu

The android framework does not provide permission to kill other app process.
You can only kill your app processes.
Process kill permission is only for system apps.
Still try using this permission in your Menifest
<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/>

Does Eclipse automatically set "uses-permissions" in Manifest?

I know it's a simple question but I can't find any answer. Well actually it's three related questions:
If my code requires a uses-permission manifest element, does Eclipse automatically add it to the manifest?
If Eclipse doesn't automatically add it, how do I know which permissions my app needs? Of course there is this list, but it's hard to go though this list checking if what my app does falls within each of these permissions.
If Eclipse doesn't automatically add the permission and I fail to do it, how will I find out? Will the app fail to install on the emulator? Will it install on the emulator but be force-closed when trying to access something it doesn't have permissions for? Or do I have to install the apk on a real device in order to find out?

If my code requires a uses-permission manifest element, does Eclipse automatically add it to the manifest?
No.
how do I know which permissions my app needs?
Generally, by reading the JavaDocs, which do a decent job of pointing out what permissions you need. Otherwise, you will find out in testing, when your app crashes with a SecurityException.
If Eclipse doesn't automatically add the permission and I fail to do it, how will I find out?
See above.
Will it install on the emulator but be force-closed when trying to access something it doesn't have permissions for?
Correct.

Eclipse will not add permissions automatically. However, if you try to use a feature that requires permission, you will be made aware of the missing permission. Here's an excerpt from android resource page on Permissions: Link
Often times a permission failure will result in a SecurityException
being thrown back to the application. However, this is not guaranteed
to occur everywhere. For example, the sendBroadcast(Intent) method
checks permissions as data is being delivered to each receiver, after
the method call has returned, so you will not receive an exception if
there are permission failures. In almost all cases, however, a
permission failure will be printed to the system log.
Your third question is answered by:
In almost all cases, however, a permission failure will be printed to
the system log.
Just in case you're wondering about what you would see in Logcat:
11-20 08:08:47.766: E/AndroidRuntime(9380):
java.lang.SecurityException: Need BLUETOOTH permission: Neither user
10111 nor current process has android.permission.BLUETOOTH.

Eclipse does not automatically add the uses-permission to your manifest. I once had forgot to add a permission and had my app fail when it got to that part of the code. I can't remember the exact error but it did mention that a permission was required to use the method I tried using and I believe that it told me what permission.
If you don't add one in then you will soon find out.

Define a permission for third-party apps to use in Android

I want to define a permission in my Android app, and let other third-party apps to use. This permission is used to restrict calling of my modules. That is, third-party apps must request the right permission to call my module, just like using system permissions defined by Android system, android.permission.INTERNET or so.
In my test, I defined the permission in my app, say "my.apps.permission.my_permission", and then install it on emulator. In some of my Activities, android:permission="my.apps.permission.my_permission" property is added. This property forces the apps calling my activities must have the right permission "my.apps.permission.my_permission". Then in a test app, request the permission in AndroidManifest.xml, <uses-permission android:name="my.apps.permission.my_permission" />
The problem is, in the test app, which will call my permission-required activities, when I call startActivity(), I got a SecurityException : Permission Denied. But, if I defined a permission with the same name in the test app, everything works fine.
And, the followings are my conclusions:
1) It seems that, the permission defined in my app, "my.apps.permission.my_permission", is not visible to other third-party apps. How to make it visible, so that other apps can use my permission just like the ones defined in Android system?
2) Even is visible, Android won't check user-defined permissions with name conflicting.(I test this by define a permission with name "android.permission.INTERNET" in test app and overrides the system-defined one, and require "android.permission.INTERNET" in my app, and still, everything works fine.) If so, every other apps can define a permission with the same name that my module requires, and cheat my app. Is that right?
Anyone can help?
Thanks a lot!

I got the answer.
My own app, which defined the permission for other apps to use, must be installed before other apps who want to use my permissions. Otherwise, those apps must be re-installed, to use my permissions. No other operations or codes are needed, just <uses-permission android:name="my.apps.permission.my_permission" />, the same as other system defined permissions.
And, several apps may define permissions with the same name, conflicting with each other. The first installed app occupies the conflicting permission name, others won't overwrite or change the original permission.